Reproductive traits in relation to crossbreeding in pigs

摘要

The aim of this study was to evaluate the effect of crossbreeding pure breeds on reproductive traits in pigs.The study was conducted on 2,431 record concerning reproductive traits of four pure breeds (large yorkshire?(LY), swedish?landrace?(SL),?duroc?(D)?and hampshire?(H)?and their reciprocal F1?crosses.?Data processing?method?was?by?the least squares?for?testing in animal?adapted?and introduced?Harvey?(1990). The results?indicated improvement?of reproductive?traits?by crossing?pure breeds. The improvements were more pronounced in three way crossing and back way crossing.?By crossing?breeds, the number?of live births and?weaned?pigs?increased?while the number of?still born?piglets?decreased?compared to?pure?breeds.Differences?in terms?of fertility?between pure breeds?can be?successfully?used?by crossing?selected?(specialized)?or?race?lines. Heterosis?effect?was?manifested?in?reproductive?traits, depending on the?choice of?crossing?scheme?involving?one of three types?of heterosis?and?breed?selection?for cross.